~~~~ How the Sperm Whale sleeps ~~~~
Is that a yawn? Whales are mammals. And like other mammals, they need to sleep. Trouble is, they live in the sea--a tough place to simply shut down and catch a few Zs. So, how do they beat drowsiness without drowning? A recent study suggests that sperm whales, at least, may be of two minds when it... Sign in to see full entry.